Acetildenafil (a.k.a. Hongdenafil) is an unapproved research chemical often detected as an undeclared adulterant in "herbal" sexual-enhancement supplements. Pharmacologically it shows sub-micromolar PDE-5 inhibition comparable to sildenafil (IC50 ≈ 7.6 nM), with a slightly longer half-life (≈ 3–5 hours) and anecdotal reports of milder facial flushing. Because it is metabolised mainly via CYP3A4, potent inhibitors can greatly increase its plasma concentration. Users report effective erectile support at 10–40 mg; however, some counterfeit tablets contain 80–120 mg, raising the risk of priapism, headache, and hypotension.
Aċetildenafil molecular structure diagram from the DrugsPRO substance library.
Also known as: Hongdenafil
Classification
Chemical: Medicine
Tag: Not psychoactive
Tag: PDE-5-inhibitor
Tag: Pyrazolopyrimidinone
Tag: Research-Chemical
Tag: Supplement
Effects
Improved Ability To Achievemaintain Erection
Increased Penile Firmness
Facialupperbody Flushing
Mild Nasal Congestion
Headachepressure Behind Eyes
Dyspepsia
Warmth In Extremities
Open Eye Visuals
Routes of Administration
Oral
Dosage
Threshold: 5 mg
Light: 5 – 15 mg
Common: 15 – 40 mg
Strong: 40 – 60 mg
Heavy: 60 mg +
Duration
Onset: 0.5-1 h
Peak: 1-2 h
Offset: 3-5 h
After Effects: 0.1-0.4 h
Sublingual
Dosage
Threshold: 2 mg
Light: 3 – 10 mg
Common: 10 – 25 mg
Strong: 25 – 40 mg
Heavy: 40 mg +
Duration
Onset: 0.17-0.75 h
Peak: 1-2 h
Offset: 3-5 h
After Effects: 0.1-0.4 h
Harm Reduction
Check interactions before mixing substances, pay attention to dose spacing and hydration, and treat all dosage guidance as approximate rather than guaranteed safe.
Sources
Substance data is aggregated from the following public harm-reduction and reference sources.
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Acetildenafil - DrugsPRO gwida tal-sustanza
Acetildenafil: Acetildenafil (a.k.a. Hongdenafil) is an unapproved research chemical often detected as an undeclared adulterant in "herbal" sexual-enhancement supplements. Pharmacologically it shows sub-micromolar PDE-5 inhibition comparable to sildenafil (IC50 ≈ 7.6 nM), with a slightly longer half